NEW  YORK  TRADE  SCHOOL 

First  Ave,,  67th  and  68th  Sts- 
NEW  YORK. 


PLUMBING  COURSE 

isro.  !7. 

Trapping  of  Fixtures. 

Copyright,  i883. 
ALL  RIGHTS  RESERVED 


NEW  YORK: 

Composition  and  Presswork  by  Day  Printing  Class. 
1896. 


Avery  Architectural  and  Fine  Arts  Library 
Gift  of  Seymour  B.  Durst  Old  York  Library 


TRAPPING  OF  FIXTURES. 


I.  After  having  trapped  the  drain  pipe  where  it  enters  the 
house,  and  ventilated  it  by  allowing  fresh  air  to  enter 
at  a  point  just  inside  the  trap  and  pass  out  through 
the  soil  pipe  at  the  roof,  is  it  necessary  to  trap  all 
fixtures  ? 


2.     What  are  the  usual  forms  of  traps  under  fixtures? 


3.     What  is  the  chief  difficulty  to  be  overcome  with  the 
traps  below  fixtures  ? 


4.     How  is  it  to  be  prevented  ? 


5.     Is  this  certain  to  prevent  S3/phona^e  ? 


6.     Does  the  water  ever  dry  in  a  trap  ? 


When  a  house  is  closed  is  there  any  means  by  which 
this  can  be  guarded  against  ? 


8.     Should  all  traps  be  so  arranged  that  they  can  be  cleaned  ? 


9- 


vShould  all  traps  be  ventilated  ? 


lo.     What  are  the  principal  points  to  be  attended  to  in  ven- 
tihitinj;  traps  ? 


II.     Is  there  any  objection  to  carrying  the  ventilating  pipe  in- 
to the  upper  part  of  soil  pipe  above  the  higest  fixture  ? 


12.     If  an  independent  ventilating  pipe  is  used  for  the  fixtures, 
where  should  it  be  carried  ? 


13.     Is  it  advantageous  to  have  it  larger  or  smaller  at  the  top 
and  why  ? 


4 


14-     How  can  fixtures  in  lower  stories  of  high  buildings  be 
prevented  from  syphoning  ? 


15.     How  should  a  kitchen  sink  be  trapped  and  where  should 
the  trap  be  placed  with  reference  to  the  waste  pipe  ? 


16.     Should  this  trap  be  larger  than  the  waste  pipe  ? 


17.    Where  should  the  trap  of  a  kitchen  sink  be  placed,  when 
the  waste  pipe  passes  through  the  leg  of  sink  ? 


5 

1 8.     If  two  or  more  wash-tubs  are  placed  together,  should  each 
tub  be  trapped,  or  will  one  trap  do  for  all  ? 


I  9.     If  two  or  more  urinals  are  placed  in  a  row  should  each  be 
trapped  separately,  or  would  one  trap  do  for  all  ? 


20.     Should  overflow  pipes  from  fixtures  have  separate  traps 
or  be  connected  with  waste  pipe  above  its  trap  ? 


2  T .    Where  should  the  trap  of  a  wash-basin  be  placed,  and  what 
is  the  general  rule  for  placing  traps  under  fixtures  ? 


6 


22.     What  is  the  best  form  of  a  trap  under  a  basin  ? 


23.     Should  it  be  larger,  smaller,  or  same  size  as  waste  pipe  ? 


24.     If  two  or  more  wash-basins  are  placed  in  a  row  will  one 
trap  do  for  all  ? 


25.     Is  there  an}-  objection  to  using  the  water-closet  trap  as  a 
trap  for  baths,  basin  or  any  other  fixtures  and  why  ? 


7 


26.     Where  should  the  waste  pipe  from  fixtures  ^^o  ? 


27.     Do  the  ventilating^  pipes  of  the  traps  under  fixtures  ever 
fail  to  work  and,  if  so,  why  ?  .  . 


28.     What  could  be  done  to  prevent  this  ? 


29.     Why  is  it  unnecessary  to  trap  the  waste  pipe  from  a  boiler  ? 


30.     Should  the  waste  pipe  under  a  safe  be  trapped  ? 


V 


8 

31.     Where  should  waste  pipes  from  safes  be  carried  ? 


32.     How  can  the  cellar  air  be  prevented  from  entering  rooms 
throiip^h  this  pipe  ? 


33.     Is  there  any  particular  objection  to  trapping  the  waste 
pipe  from  a  refrigerator  safe  ? 


34,     How  should  the  outlet  be  arranged  to  prevent  passage  of 
air  ? 


